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Now I AM baffled, - just when I thought I was beginning to understand what was going on! I understood that to extract the latent (sensible) heat from the Flue Gases, they had to be cooled BELOW the Dew Point, and therefore the water returning from the CH circuit should ideally be less than...

Hi. With a little (lot) of help from you guys out there, a Polish welder here at work, perseverance with "Google Translator" and some trial and error, I found that the ADAPT value set up in the RVP75.230 has always been set way too low (12.5). Having increased this to 25 (i.e. the top...

Many thanks for the link to the manual. I can tell from the diagrams that this is what I need! All I need now is a Polish / English dictionary and a lot of patience Anybody know the whereabouts of an English version? Thanks again..............

Thanks again for your helpful comments. I spent yesterday analysing the behaviour RVP and this is what I found Controller set to Auto Mode and heating ON - Slider switch set to Normal Operation Temperatures set in RVP Day time Room temperature set-point (Sun symbol 20...

Hi. Many thanks for your input. The information you have provide is very useful, and I think confirms that since it was installed the RVP75.230 in my Geminox boiler may never worked correctly with regard to radiators! Except by manually overriding the 3 port mixer valve, I have...

Tony, Thanks once again for your feedback. I have had a great deal of invaluable help from the Tech Support guys at Geminox in the UK (now Evinox - http://www.evinox.co.uk), however, they are not familiar with the RVP75.230 controller which was fitted by Yorkstar. I have trawled the net...

Tony, Many thanks for following up my query. The boiler is an oil (28 sec) burning Geminox FCX 20 E. (Re-badged as YorkStar) I purchased boiler, tank, and all the associated ancilliaries such as expansion vessel, and pressure reducing valve from YorkStar and installed them...

I have a technical query, which I hope someone may be able to help me with. - Ever since I installed this boiler some 12 years ago, I have not been entirely convinced that the Landis and Gyr (now Siemens) RVP75.230 controller is doing its job properly. Unless I manually override the...